230V mains-powered smoke alarm with tamperproof, rechargeable 10-year lithium battery back-up. Includes high quality optical sensor for optimal smoke detection, with fewer false alarms. Can be interlinked with up to a total of 20 Hispec mains-powered fire safety devices, including smoke, heat and CO alarms (meaning that when one alarm sounds all interlinked alarms will also activate). Suitable for use in hallways, landings, living rooms, dining rooms and bedrooms. Supplied with fixings. Interlinked when Hardwired 220 - 240V AC/DC Mains-Powered with Battery Backup 10-Year Sealed Tamperproof Lithium Integrated Battery 85dB Alarm at 3m Test/Hush Button Interlinked when Hardwired (20 Alarms can be Interlinked in 150m) Fast Fix Base Suplied for Quick & Easy Wiring Silence Nuisance Alarms Test Button Low Battery Warning Interlinked when Hardwired 220 - 240V AC/DC Mains-Powered with Battery Backup 10-Year Sealed Tamperproof Lithium Integrated Battery 85dB Alarm at 3m Test/Hush Button Inter...